Table of Contents
Advertisement
GEK-731O,
Power Circuit Breokers
Fig.
29.
(5041902)
AKRU-T) Breakerwith
speci.al
2500A
fuse
A
special 2500-amp
fuse has
been provided
for
AKRU-50
breakers.
See
Fig.
29.
This fuse
was
developed
to
provide
a
melting time characteristic
which would
coordinateparticularly well with
1600-
amp
trip
devices.
The mounting
for
this
fuse is
shown
in Figs.
29
and
31.
Replacement
of this fuse
is
a
more involved operation. The procedure
for
it
follows:
1.
Remove
the two keys
(2),
Fig.
29,
by
remov-
ing the screw
and
pulling the key
upward.
When
these have been
tal<en
out,
the
disconnect device
may be removed by
pulling
it
off
t}te end
of the
fuse
tang.
This
will
not
disturb
the
force
setting
of
the
disconnect.
2.
Remove
the upper
barrier
(4).
3.
Remove
the two
t/2
inch-L3 bolts
from
the
inner
end
of
the
fuse.
A ratchet
and socket
with
a
short extension
will
be
required.
4.
Remove
heat
sink
(3).
5. Instail
the new
fuse by reversing the disas-
sembly
procedure.
Make
sure the
mating faces of
the fuse and heat
sink are clean.
NOTE:
If
the
fuse
i.n
the
left
breaker pole
requi.res replacement, note tlzat this
fu.se
is
mounted
differently.
This
pole
is
on
the
right
when
uiewing the breaker
frotn
the
rear.
On this phase, the
fuse is
rotated
about
its
axis 180 degrees
and
tlze
tang
o_f
the
fuse
is
mou.nted beneath
the breaker
stud.
The
tangs
of
these
fuses are offset
wi.th
respect to
one
another so that
Utis
difference
does
not affect the positiott of
the
primary
dis conne
ct.
1.
z.
?
Special 2500A Fuse
Disconnect Key
Heat
Sink
4.
Upper
Barrier
5.
Prirnary
Disconnect
l.
Breaker
Stud
Z.
Heat
Sink
Fig. 31.
(134C2183)
tuIottnting
for
special
fuse
Fig.
30
30.
(22748298) Mounting
for
Class
"L"
fuse
Advertisement
Table of Contents
